# US 10,321,335 B2 · Method and user equipment for switching to dual connectivity in carrier aggregation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,321,335 B2 - Document ID: US10321335B2 - Status: Granted - Kind: B2 - Application number: 15/317,843 - Filed: 2015-06-11 - Published: 2017-04-27 - Granted: 2019-06-11 - Earliest claimed: 2014-06-12 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Daesung Hwang; Yunjung Yi; Joonkui Ahn - Web page: https://patentgrep.com/patent/US10321335B2 ## CPC - H04W 76/15: Setup of multiple wireless link connections - H04L 5/0098: {Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands} - H04L 41/08: Configuration management of networks or network elements (address allocation H04L61/50) - H04W 16/32: Hierarchical cell structures - H04W 72/542: using measured or perceived quality - H04W 76/10: Connection setup - H04W 88/02: Terminal devices - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 5/0035: {Resource allocation in a cooperative multipoint environment} - H04W 76/22: Manipulation of transport tunnels - H04W 88/06: adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A method and user equipment (UE) are provided for switching to dual connectivity in carrier aggregation. The UE applies configuration information to a second cell which is configured by a first cell for a carrier aggregation, and receives, from a base station, a message including a request for switching the second cell from the carrier aggregation to dual connectivity. The UE performs a procedure for the switching of the second cell from the carrier aggregation to the dual connectivity. The second cell becomes a primary secondary cell or a secondary cell of a secondary cell group (SCG). The UE transmits a physical uplink control channel (PUCCH) to the primary secondary cell or the secondary cell of the SCG after the switching of the second cell from the carrier aggregation to the dual connectivity. ## Claims ### Claim 1 A method of switching to dual connectivity in carrier aggregation, the method performed by a user equipment (UE) and comprising: applying, by the UE, configuration information to a second cell which is configured by a first cell for a carrier aggregation; receiving, by the UE from a base station, a message including a request for switching the second cell from the carrier aggregation to dual connectivity; performing a procedure for the switching of the second cell from the carrier aggregation to the dual connectivity; maintaining, by the UE, the configuration information, which has been applied for the carrier aggregation, thereby being applied to the second cell for the dual connectivity, wherein after the switching of the second cell from the carrier aggregation to the dual connectivity, the second cell becomes a primary secondary cell or a secondary cell of a secondary cell group (SCG); and transmitting a physical uplink control channel (PUCCH) to the primary secondary cell or the secondary cell of the SCG after the switching of the second cell from the carrier aggregation to the dual connectivity. ### Claim 2 (depends on 1) The method of claim 1, wherein the configuration information comprises at least one selected from the group consisting of a pathloss criterion, a timing criterion, a timing advance (TA) command, a transmission mode (TM), a physical downlink shared channel (PDSCH) setting, a channel state information (CSI) report setting, a physical uplink shared channel (PUSCH) setting, and a physical random access channel (PRACH) setting. ### Claim 3 (depends on 1) The method of claim 1, further comprising: deactivating the second cell which is configured for the carrier aggregation before the switching of the second cell from the carrier aggregation to the dual connectivity. ### Claim 4 A user equipment comprising: a transceiver; and a processor configured to: apply configuration information to a second cell which is configured by a first cell for a carrier aggregation, control the transceiver to receive, from a base station, a message including a request for switching the second cell from the carrier aggregation to dual connectivity, perform a procedure for the switching of the second cell from the carrier aggregation to the dual connectivity, maintain the configuration information, which has been applied for the carrier aggregation, thereby being applied to the second cell for the dual connectivity after the switching to the dual connectivity, wherein after the switching of the second cell from the carrier aggregation to the dual connectivity, the second cell becomes a primary secondary cell or a secondary cell of a secondary cell group (SCG), and wherein after the switching of the second cell from the carrier aggregation to the dual connectivity, the second cell becomes a primary secondary cell or a secondary cell of a secondary cell group (SCG), and control the transceiver to transmit a physical uplink control channel (PUCCH) to the primary secondary cell or the secondary cell of the SCG after the switching of the second cell from the carrier aggregation to the dual connectivity. ### Claim 5 (depends on 4) The user equipment of claim 4, wherein the configuration information comprises at least one selected from the group consisting of a pathloss criterion, a timing criterion, a timing advance (TA) command, a transmission mode (TM), a physical downlink shared channel (PDSCH) setting, a channel state information (CSI) report setting, a physical uplink shared channel (PUSCH) setting, and a physical random access channel (PRACH) setting. ### Claim 6 (depends on 4) The user equipment of claim 4, wherein the processor is further configured to: deactivate the second cell which is configured for the carrier aggregation before the switching of the second cell from the carrier aggregation to the dual connectivity.